4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Dave Martin <dave.mar...@arm.com> commit 228dbbfb5d77f8e047b2a1d78da14b7158433027 upstream. Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved. Fixes: 5be6f62b0059 ("ARM: 6883/1: ptrace: Migrate to regsets framework") Signed-off-by: Dave Martin <dave.mar...@arm.com> Acked-by: Russell King <rmk+ker...@armlinux.org.uk> Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/arm/kernel/ptrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -600,7 +600,7 @@ static int gpr_set(struct task_struct *t const void *kbuf, const void __user *ubuf) { int ret; - struct pt_regs newregs; + struct pt_regs newregs = *task_pt_regs(target); ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs,